import React, { useContext, useEffect, useRef, useState } from 'react';
import { Button, Form, Input, Popconfirm, Table } from 'antd';
import axios from 'axios'

const EditableContext = React.createContext(null);
const EditableRow = ({ index, ...props }) => {
  const [form] = Form.useForm();
  return (
    <Form form={form} component={false}>
      <EditableContext.Provider value={form}>
        <tr {...props} />
      </EditableContext.Provider>
    </Form>
  );
};

const EditableCell = ({
  title,
  editable,
  children,
  dataIndex,
  record,
  handleSave,
  ...restProps
}) => {
  const [editing, setEditing] = useState(false);
  const inputRef = useRef(null);
  const form = useContext(EditableContext);
  useEffect(() => {
    if (editing) {
      inputRef.current.focus();
    }
  }, [editing]);
  const toggleEdit = () => {
    setEditing(!editing);
    form.setFieldsValue({
      [dataIndex]: record[dataIndex],
    });
  };
  const save = async () => {
    try {
      const values = await form.validateFields();
      toggleEdit();
      handleSave({
        ...record,
        ...values,
      });
    } catch (errInfo) {
      // console.log('Save failed:', errInfo);
    }
  };
  let childNode = children;
  if (editable) {
    childNode = editing ? (
      <Form.Item
        style={{
          margin: 0,
        }}
        name={dataIndex}
        rules={[
          {
            required: true,
            message: `${title} is required.`,
          },
        ]}
      >
        <Input ref={inputRef} onPressEnter={save} onBlur={save} />
      </Form.Item>
    ) : (
      <div
        className="editable-cell-value-wrap"
        style={{
          paddingRight: 24,
        }}
        onClick={toggleEdit}
      >
        {children}
      </div>
    );
  }
  return <td {...restProps}>{childNode}</td>;
};

const NewsCategory = () => {
  const [dataSource, setDataSource] = useState([]);
  const [count, setCount] = useState(0);

  useEffect(() => {
    axios.get(`/categories`).then(res => {
      setDataSource(res.data)
      setCount(res.data.length + 1);
    })
  }, [])

  const handleDelete = (id) => {
    axios.delete(`/categories/${id}`).then(res => {
      const newData = dataSource.filter((item) => item.id !== id);
      setDataSource(newData);
    })
  };
  const defaultColumns = [
    {
      title: 'ID',
      dataIndex: 'id',
      render: (id) => {
        return <b>{id}</b>
      }
    },
    {
      title: '栏目名称',
      dataIndex: 'title',
      width: '30%',
      editable: true,
    },
    {
      title: '操作',
      dataIndex: '操作',
      render: (_, record) =>
        dataSource.length >= 1 ? (
          <Popconfirm title="Sure to delete?" onConfirm={() => handleDelete(record.id)}>
            <a>删除</a>
          </Popconfirm>
        ) : null,
    },
  ];
  const handleAdd = () => {
    const newData = {
      id: count,
      title: `Edward King ${count}`,
      value: `London, Park Lane no. ${count}`,
    };

    axios.post(`/categories`, newData).then(res => {
      setDataSource([...dataSource, newData]);
      setCount(count + 1);
    })

  };
  const handleSave = (row) => {//保存编辑行
    const newData = [...dataSource];
    const index = newData.findIndex((item) => row.id === item.id);
    const item = newData[index];

    if (item != row) {
      axios.patch(`/categories/${row.id}`, { title: row.title, value: row.title }).then(res => {
        newData.splice(index, 1, {
          ...item,
          ...{ title: row.title, value: row.title },
        });
        setDataSource(newData);
      })
    }
  };

  const components = {
    body: {
      row: EditableRow,
      cell: EditableCell,
    },
  };

  const columns = defaultColumns.map((col) => {
    if (!col.editable) {
      return col;
    }
    return {
      ...col,
      onCell: (record) => ({
        record,
        editable: col.editable,
        dataIndex: col.dataIndex,
        title: col.title,
        handleSave,
      }),
    };
  });
  return (
    <div>
      <Button
        onClick={handleAdd}
        type="primary"
        style={{
          marginBottom: 16,
        }}
      >
        Add a row
      </Button>
      <Table
        components={components}
        rowClassName={() => 'editable-row'}
        bordered
        dataSource={dataSource}
        columns={columns}

        rowKey={(item) => item.id}
      />
    </div>
  );
};
export default NewsCategory;